1. Volume 38, Issue 3, Pages 541-554 (March 2013)
Tumor Necrosis Factor-α Blocks Differentiation and Enhances Suppressive Activity of Immature Myeloid Cells during Chronic Inflammation 
Moshe Sade-Feldman, Julia Kanterman, Eliran Ish-Shalom, Mazal Elnekave, Elad Horwitz, Michal Baniyash 
Immunity 
Volume 38, Issue 3, Pages (March 2013)
DOI: /j.immuni
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2. Immunity 2013 38, 541-554DOI: (10.1016/j.immuni.2013.02.007)
Copyright © 2013 Elsevier Inc. Terms and Conditions

3. Figure 1 TNF-α Augments the Chronic Inflammatory Response
(A) A mouse model for chronic inflammation was established by repeated injections of heat-killed BCG bacteria; the mice were sacrificed at day +2, after the last treatment.
(B) Quantitative PCR analysis for TNF-α mRNA expression in isolated MDSCs from control (noninflamed) and chronically inflamed Tnf+/+ mice, presented as relative quantification (RQ) compared to the expression in MDSCs from control mice, set as 1. Data of three experiments are presented (mean ± SEM, n = 3 per group).
(C) The weight of spleens was evaluated at day +2 after the third BCG injection.
(D and E) The percentage and absolute numbers of MDSCs (Gr-1+CD11b+) at day +2 after the last BCG treatment in the spleen (D) and bone marrow (BM) (E) are presented. Results are representative of three or more independent experiments (error bars show SD, n = 4–7 per group).
∗p < 0.03; ∗∗p < 0.005; ∗∗∗p < (t test). See also Figure S1.
Immunity  , DOI: ( /j.immuni )
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4. Figure 2 TNF-α Promotes T Cell Dysfunction via MDSCs
(A and B) Splenic CD3+ cells were fixed, permeabilized, and double stained for total expression of the ζ (A) or CD3ε (B) chains, as shown by mean fluorescence intensity (MFI). ζ chain expression plots are of gated CD3+ cells.
(C) MDSCs were in vivo depleted in inflamed Tnf+/+ mice by three i.p. injections of Gr1 mAbs. 12 hr later, CFSE-labeled splenocytes from normal Tnf+/+ mice (donor cells) were adoptively transferred into inflamed Gr1 mAb-treated and -untreated mice (hosts). After 24 hr, splenocytes were harvested and stained for ζ expression (MFI) in CD3+ T cells within the CFSE+ (donor) or CFSE− (host) cells.
(D) Splenocytes were labeled with CFSE and activated with CD3 and CD28 antibodies (black lines), or left nonactivated (gray histograms). The proliferative response was assessed by monitoring cell divisions of gated CFSE-labeled Thy1.2+ cells.
(E) Mice were immunized with CMV-OVA plasmid and on day +2 after the last BCG injection the mice were adoptively transferred with 4 × 106 CFSE-labeled OT-I splenocytes into inflamed or noninflamed mice. Additionally, one group was treated for the depletion of MDSCs by Gr-1 mAbs. 4 days later, the spleens were harvested to analyze the proliferation of the transferred OT-I CD8+ T cells by flow cytometry.
(F) A representative plot gated on dividing OT-I CD8+ T cells in the spleens of inflamed and noninflamed mice (top); numbers indicate the percentage of dividing cells (bottom).
Results are representative of three independent experiments (error bars show SD, n = 4–7 per group). ∗∗p < 0.005; ∗∗∗p < (t test). See also Figure S2.
Immunity  , DOI: ( /j.immuni )
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5. Figure 3 TNF-α Promotes NK Cell Dysfunction via MDSCs
(A and B) MFI of total ζ chain (A) and NCR1 (B) expression in NK (NCR1+) cells.
(C) ζ expression (MFI) was evaluated in NCR1+ NK cells CFSE+ (donor) or CFSE− (host) cells, after MDSCs were in vivo depleted, as described in Figure 2C.
(D) CFSE-labeled allogeneic (CFSElo) and syngeneic (CFSEhi) cells were i.v. injected into mice 2 days after the last BCG injection. The cytotoxic activity of NK cells was assessed 24 hr after administration of cells. Additionally, one group was depleted from MDSCs by Gr-1 mAbs.
(E) A representative plot of CFSE allogeneic and syngeneic cell clearance within the spleens of mice is shown (top); numbers indicate the percentages of specific allogeneic cell clearance (bottom).
Results are representative of three or more independent experiments (error bars show SD, n = 4–6 per group). ∗p < (t test). See also Figure S3.
Immunity  , DOI: ( /j.immuni )
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6. Figure 4 TNF-α Induces Arrest in MDSC Differentiation
(A) A profile of the percentage and absolute number of splenic CD11c+ and F4/80+ cells, gated on CD11b+ cells, in the spleen is presented.
(B) The expression of MHCII+CD80+ in CD11c+ and F4/80+ spleen-derived cells.
(C) MDSCs isolated from spleens of inflamed mice were cultured with GM-CSF for 3 and 5 days, and the cells’ phenotype was evaluated. Representative plots of CD11c+CD11b+ (left) and F4/80+CD11b+ (middle) cells are shown; numbers indicate the percentages of differentiated cells (right).
(D) The percentage of MHCII+CD80+ double-positive CD11c+ and F4/80+ cells differentiated form spleen-derived MDSCs isolated from inflamed mice.
(E) MFI of ζ chain in normal isolated CD3+ T cells coincubated for 24 hr with differentiated MDSCs (treated with GM-CSF) or poorly differentiated MDSCs (treated with BCGAg) from inflamed Tnf+/+ mice at a 1:4 ratio. Before coincubation with the isolated T cells, MDSCs were cultured with GM-CSF (10 ng/ml) or BCG (50 μg/ml) for 4 days.
Results are representative of three independent experiments (error bars show SD, n = 4–5 per group). ∗p < 0.02; ∗∗p < (t test). See also Figure S4.
Immunity  , DOI: ( /j.immuni )
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7. Figure 5
TNF-α Blocks MDSC Maturation via S100A8 and S100A9 and RAGE Proteins
(A) S100A8 and S100A9 mRNA expression in splenocytes are shown relative to Tnf+/+ noninflamed mice, set as 1.
(B) S100A8 and S100A9 mRNA expression in isolated spleen-derived MDSCs is shown relative to Tnf+/+ MDSCs (set as 1). Data of two independent experiments are presented (mean ± SEM).
(C) S100A9, S100A8, and RAGE protein expression in splenic MDSCs isolated from inflamed mice were evaluated by immunoblotting. α-Tubulin served as a control.
(D) S100A9, S100A8, and RAGE expression in splenic MDSCs isolated from inflamed Tnf−/− mice incubated with GM-CSF and TNF-α for 3 days were evaluated by immunoblotting. α-Tubulin served as a control.
(E) MDSCs isolated from spleens of inflamed Tnf−/− mice were cultured with GM-CSF, TNF-α, RAGE antibody, and S100A8 and S100A9 antibodies (together or separately) for 5 days, and cells’ phenotype was evaluated. Results are representative of two or more independent experiments (error bars show SD, n = 4–9 per group).
∗p < 0.01; ∗∗p < (t test). See also Figure S5.
Immunity  , DOI: ( /j.immuni )
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8. Figure 6 TNF-α Enhances MDSC Suppressive Activity
(A) Purified normal CD3+ T cells were coincubated with isolated spleen-derived MDSCs from inflamed mice at different ratios. After 16 hr, ζ chain expression (MFI) in T cells was analyzed and compared to T cells incubated alone.
(B) CFSE-labeled CD3+ T cells activated with CD3 and CD28 antibodies were coincubated with isolated spleen-derived MDSCs from inflamed mice at different ratios. Proliferation was assessed by monitoring cell divisions of gated CFSE-labeled Thy1.2+ cells after 72 hr and compared to CD3+ T cells activated alone.
(C) Analysis of iNOS and arginase 1 mRNA in isolated spleen-derived MDSCs from inflamed mice relative to the expression in Tnf+/+ MDSCs (set as 1). Data of two experiments are presented (mean ± SEM).
(D) Immunoblotting of iNOS and arginase 1 in isolated spleen-derived MDSCs from inflamed mice. α-Tubulin served as a control.
(E and F) Intracellular concentration of ROS (E) and NO− (F) in spleen-derived MDSCs from inflamed mice were evaluated.
(G) Spleen-derived MDSCs isolated from inflamed mice were stimulated with BCG (50 μg/ml) for 48 hr. Cell lysates were collected and measured for arginase 1 activity. Results are representative of three independent experiments (error bars show SD, n = 4–5 per group).
∗p < 0.02; ∗∗p < 0.005; ∗∗∗p < (t test). See also Figure S6.
Immunity  , DOI: ( /j.immuni )
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9. Figure 7
Administration of Etanercept Modulates MDSCs and Restores Immune Functions
(A) WT mice were injected daily with etanercept from 1 day prior to the second BCG injection until 1 day before mice were sacrificed.
(B) The percentage of MDSCs in the spleen is presented.
(C) Percentage of CD11c+ and F4/80+ cells in spleens is presented; plots are gated on CD11b+ cells.
(D and E) CFSE-labeled splenocytes from normal Tnf+/+ mice (donor cells) were adoptively transferred into mice (hosts). After 24 hr, splenocytes were harvested and stained for ζ expression (MFI) in CD3+ T (D) and NCR1+ NK (E) cells within the CFSE+ (donor) or CFSE− (host) cells.
(F) In vivo NK cytotoxicity assay was performed as described in Figure 3D. Allogeneic cell clearance in the spleen and blood are presented.
(G) In vivo T cell proliferation was performed as described in Figure 2E. A representative plot gated on dividing OT-I CD8+ T cells in the spleens (right); numbers indicate the percentage of dividing cells (left).
Results are representative of two independent experiments (error bars show SD, n = 7 per group). ∗p < 0.02; ∗∗p < 0.003; ∗∗∗p < (t test). See also Figure S7.
Immunity  , DOI: ( /j.immuni )
Copyright © 2013 Elsevier Inc. Terms and Conditions